The colour of $\mathrm{Mg}(\mathrm{OH})_2$ precipitate formed when it is precipitated in the presence of…

The colour of $\mathrm{Mg}(\mathrm{OH})_2$ precipitate formed when it is precipitated in the presence of magneson reagent is
  1. Green
  2. Yellow
  3. Brown
  4. Blue

Solution


It is a violet dye and experimentally as a $\mathrm{pH}$ indicator, appearing yellow below $\mathrm{pH11}$ and violet above $\mathrm{pH} 13$. In alkaline medium, it forms a complex with $\mathrm{Mg}^{2+}$, which is deep blue in colour.

Asked in: AP EAMCET 2022 (06 Jul Shift 1)

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